Transient protection envelope for 85.5 V rails
The 1.5KE100CAHE3_A/C: Its 85.5 V reverse standoff voltage means it sits across a nominal 85 V DC bus without conducting leakage current, then clamps transients at 137 V maximum — the voltage the downstream silicon sees during a surge event. The minimum breakdown voltage is 95 V, so the device begins to avalanche at that threshold. Peak pulse current is 10.9 A at the clamping voltage, defining the maximum surge the part can absorb in a single event before the junction temperature exceeds the 175°C limit.
Automotive qualification and deployment context
This part carries AEC-Q101 qualification, the automotive discrete semiconductor stress test standard covering temperature cycling, high-temperature reverse bias, and ESD robustness. The -55°C to 175°C operating junction range suits under-hood and engine-bay environments where ambient temperatures exceed 125°C. The DO-201AA axial-lead package (also known as DO-27) is a through-hole form factor rated for the full 1500 W pulse. The leaded body dissipates heat through the PCB copper pads — the thermal path is through the solder joint and trace, not a heatsink.